For such fields deep historical studies can have considerable contempo — Kurt Danziger

"The basis for Wundt’s initial discussion of the problem of introspection is provided by his insistence on the distinction between “self-observation” (Selbstbeobachtung) and “internal perception” (innere Warhnemung)."

"The severe restrictions which Wundt placed on introspection also manifest themselves in the types of judgment that his experimental subjects were required to make. In accordance with the precept that internal perception can only become observation insofar as it is linked to controllable external stimuli, the introspective reports from his laboratory are very largely limited to judgments of size, intensity, and duration of physical stimuli, supplemented at times by judgments of their simultaneity and succession."

"The reaction time studies conducted during the first few years of Wundt’s laboratory constitute the first historical example of a coherent research program, explicitly directed toward psychological issues and involving a number of interlocking studies."

"What exactly constitutes a field like scientific psychology? Is it constituted by its most innovative and influential contributors; by the scientific findings that it has produced; by the theories it has elaborated; by its concepts, techniques, or professional associations? Obviously, all this and more goes into the making of a field, but most of us would probably see some of these components as playing a more essential role than others. Even if we refuse to commit ourselves explicitly we are likely to imply that certain components define the field more effectively than others by the way we organize our knowledge."

"For applied psychology, whether American or German, it never had the slightest appeal, as is shown by the figures for the relevant journals, Zeitschrift fiir angewandte Psychologie, Journal of Applied Psychology, and Journal of Educational Psychology. Applied psychology had committed itself to knowledge goals that were unlikely to be advanced by the kind of investigative practice associated with Wundts laboratory. What it was after was knowledge that could be quickly utilized by agencies of social control so as to make their work more efficient and more rationally defensible."

"Internal perception also fails as a method for scientific psychology. In the nature of the case, it must be casual and therefore unsystematic. It excludes all deliberate investigation, because as soon as it becomes aware of itself it turns into the self-observation that is open to all the well-known and valid criticisms. It is, indeed, the basis of a psychology of consciousness, in the sense that conscious processes must be perceived to be known, but for a science it is not enough."